共和干热岩地热井GR2井区三维地应力场反演分析

GR2 地热井位于共和恰卜恰镇，干热岩地热井井深达到4000 米，大深度井区极大增加了反演的难度．井区附近20 千米内无大型构造，附近地应力场的主要影响因素为板块构造应力和自重应力．由于井中未进行三维地应力场测井工作，所以我们以地面地应力调查结果和震源机制解反演结果为依据，基于MIDAS GTS 和大比例尺高清卫星云图建立有限元数值模型，使用改进的边界法进行反演计算，最终预估了井中地应力场分布特征．对于后续的井网布置以及干热岩井场开采具有重要意义．

Inversion Analysis of 3D Geostress Field in GR2 Well Area of Gonghe Hot Rock Geothermal Well

GR2 geothermal well is located in the Qia Bu Qia Town of Gonghe. The depth of the hot dry rock geothermal well reaches 4000 meters. The deep wells greatly increase the difficulty of inversion. There is no large structure within 20 km of the well area. The main factors affecting the in-situ stress field are the plate tectonic stress and the gravity stress. Because there is no three-dimensional stress field logging in the well, we set up the finite element numerical model based on the results of the ground stress investigation and the source mechanism solution, Based on MIDAS GTS and large-scale high-definition satellite cloud images, and using the improved boundary method to calculate the inversion, we finally predict the features of the geostress fields in the well. This work is important for the subsequent well pattern layout and the dry hot rock well site mining.